Mycoflora and aflatoxin/fumonisin production by fungal isolates from freshly harvested corn hybrids

Brazilian Journal of Microbiology

Adriana P. Almeida²  Benedito Corrêa²  Marisa A. B. Mallozzi¹  Eduardo Sawazaki¹  Lúcia M. Valente Soares¹ 

[1] ,Universidade de São Paulo Instituto de Ciências Biomédicas Departamento de MicrobiologiaSão Paulo SP ,Brasil

关键词: aflatoxins;    Aspergillus flavus;    fumonisins;    Fusarium moniliforme;    corn;    Aflatoxinas;    Aspergillus flavus;    fumonisinas;    Fusarium moniliforme;    milho;   

DOI  :  10.1590/S1517-83822000000400016

来源: SciELO

【 摘 要 】

The mycoflora of 3 hybrids of freshly harvested corn grains collected from three regions of the state of São Paulo, Brazil (Assis, Capão Bonito and Ribeirão Preto) was investigated. A total of 66 samples were analyzed focusing on the influence of abiotic factors (moisture content, water activity, temperature and rainfall) on both the prevalence of Aspergillus flavus and Fusarium moniliforme, and the ability of these genera isolates to produce aflatoxins and fumonisins, respectively. In the three surveyed regions, the fungal population comprised mainly Fusarium spp., Penicillium spp., Aspergillus spp. and 2 others filamentous fungal genera, which were isolated from corn kernels showing water activity of 0.30 to 0.99 and moisture content of 5.0% to 20.2%. Among the genera Fusarium and Aspergillus, the most frequent species were F. moniliforme and A. flavus, respectively. Concerning the toxigenic potential of F. moniliforme, all isolated strains (40) produced fumonisins at 20 mug/g to 2168 mug/g (FB1) and/or 10 mug/g to 380 mug/g (FB2). From the 10 A. flavus isolates, 6 strains (60.0%) produced aflatoxins at 615 mug/kg to 30.750 mug/kg (AFB1) and/or 11 mug/kg to 22 mug/kg (AFB2).

【 授权许可】

CC BY-NC   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License